1. scared, fearful, disquieted, apprehensive, timid, timorous. Afraid,alarmed,frightened,terrified all indicate a state of fear. Afraid implies inner apprehensive disquiet: afraid of the dark.Alarmed implies that the feelings are aroused through realization of some imminent or unexpected danger to oneself or others: alarmed by (or about ) someone's illness.Frightened means shocked with sudden, but usually short-lived, fear, especially that arising from apprehension of physical harm: frightened by an accident.Terrified suggests the emotional reaction when one is struck with a violent, overwhelming fear: terrified by an earthquake.

early 14c., originally past participle of afray "frighten," from Anglo-French afrayer, from Old French esfreer (see affray (n.)). A rare case of an English adjective that never stands before a noun. Because it was used in A.V. Bible, it acquired independent standing and thrived while affray faded, chasing out the once more common afeared. Sense in I'm afraid "I regret to say, I suspect" (without implication of fear) is first recorded 1590s.

Her blue affrayed eyes wide open shone [Keats, "The Eve of St. Agnes," 1820]